Japanese name:

結城 蛍

Kei is a childhood friend of Sawaki and, like him, a freshman. His parents run a sake brewery (making them customers for the mold starter from Sawaki's parents). It is revealed after a brief disappearance by Kei from the main plot, that Kei is gender dysphoric, and that he has stronger feelings for Sawaki than initially let on.

Seiyuu: Saiga Mitsuki

MAL

Edit